I want to work on this CriteriaItem code is defined in three columns in the database...1. ItemCode which will store current item code after concatenating it with headcode.2. HeadCode which is the predecessor of the current item.3. ItemLevel which will store the hierarchy order of the item.Lets suppose we have selected a Control for that item whose item code was stored in the database as 101,this means it's itemlevel is 2(1st digit for level 1 and 2nd and 3rd for level 2).------------------------------------ItemCode HeadCode ItemLevel 101 1 2 -------------------------------------Now when we select current item, we will take its predecessor control item's itemcode as its head code ...increment the predecessor control item's itemlevel and concatenate the new item code with the headcode(101+01)...i have taken 01 because it is the 1st item of level 3...if level 3 items already exist just assign the code likewise...for example if u see that there are already 3 items of level 3...you will assign the new itemcode as:10104... --------------------------------------ItemCode HeadCode ItemLevel10101 101 3--------------------------------------